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EP4067632B1 - Verfahren zur verwaltung der öltemperatur eines getriebes eines kraftfahrzeugs - Google Patents

Verfahren zur verwaltung der öltemperatur eines getriebes eines kraftfahrzeugs Download PDF

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Publication number
EP4067632B1
EP4067632B1 EP21166410.7A EP21166410A EP4067632B1 EP 4067632 B1 EP4067632 B1 EP 4067632B1 EP 21166410 A EP21166410 A EP 21166410A EP 4067632 B1 EP4067632 B1 EP 4067632B1
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EP
European Patent Office
Prior art keywords
oil
circuit
oil temperature
motor vehicle
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21166410.7A
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English (en)
French (fr)
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EP4067632A1 (de
Inventor
Nicolas GRANOTTIER
Baptiste BOUTIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Truck Corp
Original Assignee
Volvo Truck Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volvo Truck Corp filed Critical Volvo Truck Corp
Priority to EP21166410.7A priority Critical patent/EP4067632B1/de
Priority to US17/695,522 priority patent/US11892072B2/en
Priority to CN202210281785.9A priority patent/CN115143270A/zh
Publication of EP4067632A1 publication Critical patent/EP4067632A1/de
Application granted granted Critical
Publication of EP4067632B1 publication Critical patent/EP4067632B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/005—Controlling temperature of lubricant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
    • F01M5/021—Conditioning lubricant for aiding engine starting, e.g. heating by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0413—Controlled cooling or heating of lubricant; Temperature control therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0412—Cooling or heating; Control of temperature
    • F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
    • F16H57/0417—Heat exchangers adapted or integrated in the gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
    • F16H57/0436—Pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
    • B60Y2306/00—Other features of vehicle sub-units
    • B60Y2306/03—Lubrication

Definitions

  • the invention concerns the field of motor vehicle transmissions and more particularly the lubrication of the transmission.
  • the invention can be applied in heavy-duty vehicles, such as trucks, buses and construction equipment.
  • the development of new electric drives for electric or hybrid vehicles requires adaptations in terms of cooling and lubrication.
  • An internal combustion engine provides, via a pulley and belt driven by the crankshaft directly, the force required to drive an oil pump in the lubrication circuit and/or a water pump in the cooling circuit.
  • the electric motor is only used to move the vehicle and/or generate electric current.
  • the pumps of the lubrication and cooling circuits are electric.
  • the lubrication circuit usually includes a heat exchanger During cold starts in low temperature conditions, it is desirable that the oil reaches a minimum temperature to ensure optimum lubrication of the transmission.
  • GB 2545349 and US 2019/070924 disclose known methods of managing the oil temperature of a transmission of a motor vehicle.
  • the first object of the invention is to provide a method of managing the oil temperature of a transmission of a motor vehicle increasing the oil temperature during cold start of the vehicle without using additional component.
  • the object is achieved by a method of managing the oil temperature of a transmission of a motor vehicle, the transmission comprising a lubrication circuit and an oil temperature management circuit, the oil temperature management circuit comprising a liquid/liquid heat exchanger mounted on the lubrication circuit, the lubrication circuit comprises a pump for circulating the oil in the lubrication circuit and a temperature sensor characterized in that, before a starting stage of the vehicle, if the temperature of the oil is lower than a first value, the pump of the lubrication circuit is activated so as to circulate the oil in the liquid/liquid exchanger.
  • the heat capacity left in a coolant circuit is used to warm the oil before starting the vehicle.
  • the first value of the temperature is between -10°C and 10°C. This temperature corresponds to the operational temperature of the oil.
  • the oil temperature management circuit is connected to a battery temperature management fluid circuit of the motor vehicle, so that before the starting step of the vehicle, the battery temperature management fluid circuit is activated, so as to raise the temperature in the exchanger of the oil temperature management circuit.
  • the second value of the oil temperature is greater than 0°C.
  • the circulation of oil in the liquid/liquid exchanger is stopped or by-pass.
  • a second object of the invention is to provide a lubrication circuit of a motor vehicle transmission comprising:
  • the first temperature value is between -10°C and 10°C.
  • the oil temperature management circuit is connected to a battery temperature management fluid circuit of the motor vehicle, so that a control unit controls the battery temperature management fluid circuit of the motor vehicle, so that it is activated before the vehicle is started, in order to raise the temperature in the exchanger of the oil temperature management circuit.
  • a third object of the invention is to provide a motor vehicle comprising a circuit for lubricating a transmission according the second object of the invention
  • a fourth object of the invention is to provide a control unit for controlling at least the following components:
  • Fig. 1 is a schematic view of vehicle transmission with its lubrication circuit
  • a motor vehicle transmission comprises in a manner known per se a housing 1, in which the transmission components such as bearings 10, pinions 11, shafts 12 are housed.
  • the lower part 13 of housing 1 is the oil reservoir, hereinafter referred to as the sump. This oil is used to lubricate transmission components 10, 11, 12.
  • a lubrication circuit 2 is provided to circulate the oil in the transmission.
  • the transmission system includes a pump 21 that draws oil from the lower part of the sump 13 and circulates it through lubrication system 2.
  • Lubrication system 2 also includes a filter 24 and a temperature sensor 23 for the oil circulating in lubrication system 2.
  • Lubrication system 2 includes at least one nozzle or jet 26 near components 10, 11, 12 of the transmission to be lubricated.
  • pump 21 is an electric pump. In other words, pump 21 can be activated or deactivated independently of the movement of the vehicle or the activation of the vehicle's propulsion system.
  • a heat exchanger 30, e.g. liquid/liquid, is also fitted to lubrication circuit 2, in order to adjust the oil temperature, for example, to ensure optimum lubrication.
  • the heat exchanger 30 can, for example, be a component of a cooling/heating circuit 3 of a motor vehicle battery pack 34.
  • the cooling/heating circuit consists of one or more of the following components: a pump 33, an electric heater 32, an air/liquid exchanger (not shown).
  • the lubrication circuit 2 may include a bypass circuit 22 of the liquid/liquid exchanger 30.
  • This by-pass circuit 22 includes a valve 25 which, in the closed position, allows oil to circulate in the liquid/liquid exchanger 30, and in the open position, allows oil not to circulate in the liquid/liquid exchanger 30.
  • the valve 25 could be put in any intermediate position to manage the heat transfer to the oil.
  • the motor vehicle also includes a control unit 4 connected to the following components among others:
  • the control unit 4 is also connected to a vehicle start detection module 5.
  • This detection module 5 is used to determine the imminence of the vehicle start.
  • detection module 5 is connected to the vehicle's remote locking system and/or vehicle ignition and/or seat belt buckle sensor or other user actuated device just prior to vehicle start.
  • the pump 21 of the lubrication circuit is activated by the control unit 4, in order to supply the circuit oil to the transmission components and thus ensures optimum lubrication.
  • valve 25 of bypass circuit 22 is kept in the open position.
  • This first temperature value corresponds to a maximum temperature above which the lubricating properties of the oil deteriorate.
  • Valve 25 of the bypass circuit 22 is activated by the control unit, which also receives a temperature signal from the temperature sensor 23.
  • valve 25 of the bypass circuit 22 When the oil temperature in lubrication circuit 2 is above or equal the first value, valve 25 of the bypass circuit 22 is held in the closed position, so that the oil flows through the liquid/liquid exchanger 30 to be cooled.
  • the lubricating properties of the oil also deteriorate if the oil temperature is too low.
  • a motor vehicle's transmission will be called upon when the oil temperature is low. This is the case, for example, when the motor vehicle is parked at a standstill (engine off) while the outside temperature is low or very low (below zero degrees for example).
  • the purpose of the invention is to allow an increase in the oil temperature before starting the vehicle and loading the transmission without changing the lubrication circuit.
  • pump 21 of the lubrication circuit is activated and valve 25 of the bypass circuit 22 is closed, so that the oil circulates in the liquid/liquid exchanger 30.
  • the liquid/liquid exchanger 30 is in fact a heat source, since the heat transfer fluid used in the liquid/liquid exchanger 30 has the function of cooling the oil and thus storing heat when the vehicle is in operation. When the vehicle is in operation these calories are evacuated via the exchanger of the cooling circuit 2 of the batteries 34. When the vehicle stops, the heat transfer fluid remains warm for a certain period (from a few minutes to a few hours). It is therefore understandable that the oil will heat up in the liquid/liquid exchanger 30 when the vehicle has not yet started.
  • control unit 4 sends a signal to open valve 25 of the bypass circuit, so that the oil no longer flows through the liquid/liquid exchanger 30.
  • the first temperature value corresponds to a temperature at which the lubricating properties of the oil are satisfactory or even optimal. Therefore, it is no longer necessary to heat the oil.
  • the first value depends on the quality of the oil and is, for example, between -10°C and 10°C.
  • valve 25 of the bypass circuit is kept in close position, allowing circulation in liquid/liquid exchanger 30, as long as the oil temperature is below the temperature inside the liquid/liquid exchanger. Then, even after starting the vehicle, the oil continues to be heated by circulating into liquid/liquid exchanger
  • control unit 4 can also activate the electric heater 32 and the pump 33 of the cooling/heating circuit 3 of the vehicle's battery pack 34. In this way, the temperature of the cooling/heating fluid in cooling/heating circuit 3 will increase rapidly even in the liquid/liquid exchanger 30. In addition, the oil will also heat up as it circulates through the liquid/liquid exchanger 30.
  • the vehicle will only start or be started when the oil temperature is above a second value. This ensures that the oil is at a temperature that ensures optimum lubrication.
  • the second temperature value is higher than the first value.
  • the method of oil temperature management according to the invention ensures minimal reheating of the transmission oil with a start, without the need to modify the oil circuit and/or add a specific oil heating element.
  • the oil temperature does not reach a second value after a certain period of time (from few second to maximum of 5min) start of the vehicle will be possible.
  • the control unit 4 therefore comprises a computer program capable of executing the commands necessary to implement the method according to the invention.
  • the computer program includes a signal processing unit receiving the signal from the temperature sensor representative of the oil temperature value as well as the signal from the vehicle start detection module 5.
  • the control unit 4 also includes a control signal generating unit for, among other things, activating or deactivating the following components:

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Details Of Gearings (AREA)

Claims (11)

  1. Verfahren zur Steuerung der Öltemperatur eines Kraftfahrzeuggetriebes, wobei das Getriebe einen Schmierkreislauf (2) und einen Öltemperatur-Steuerkreislauf (3) umfasst, wobei der Öltemperatur-Steuerkreislauf einen Flüssig/Flüssig-Wärmetauscher (30) umfasst, der auf dem Schmierkreislauf (2) montiert ist, der Schmierkreislauf (2) eine Pumpe (21) für die Umwälzung des Öls im Schmierkreislauf und einen Temperatursensor (23) umfasst, dadurch gekennzeichnet, dass vor einer Startphase des Fahrzeugs, wenn die Temperatur des Öls unter einem ersten Wert liegt, die Pumpe (21) des Schmierkreislaufs aktiviert wird, um das Öl im Flüssig/Flüssig-Tauscher (30) umzuwälzen.
  2. Verfahren zur Steuerung der Öltemperatur eines Kraftfahrzeuggetriebes nach Anspruch 1, dadurch gekennzeichnet, dass der erste Wert der Temperatur zwischen - 10 °C und 10 °C liegt.
  3. Verfahren zur Steuerung der Öltemperatur eines Kraftfahrzeuggetriebes nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass X der Öltemperatur-Steuerkreislauf mit einem Batterietemperatur-Steuerungsflüssigkeitskreislauf (3) des Kraftfahrzeugs verbunden ist und dass vor dem Startschritt des Fahrzeugs der Batterietemperatur-Steuerungsflüssigkeitskreislauf (33) aktiviert wird, um die Temperatur im Flüssig/Flüssig-Tauscher (30) des Öltemperatur-Steuerkreislaufs zu erhöhen.
  4. Verfahren zur Steuerung der Öltemperatur eines Kraftfahrzeuggetriebes nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Schritt des Startens des Fahrzeugs, wenn die Öltemperatur einen zweiten Wert erreicht, oder nach einer bestimmten Zeitdauer, die nicht länger als 5 Minuten beträgt, durchgeführt wird.
  5. Verfahren zur Steuerung der Öltemperatur eines Kraftfahrzeuggetriebes nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass der zweite Wert der Öltemperatur größer als 0 °C ist.
  6. Verfahren zur Steuerung der Öltemperatur eines Kraftfahrzeuggetriebes nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass bei einer Öltemperatur, die über dem ersten Wert liegt, das Umwälzen des Öls im Flüssig/Flüssig-Tauscher (30) gestoppt wird.
  7. Schmierkreislauf eines Kraftfahrzeuggetriebes, bestehend aus:
    - einer Pumpe (21) zur Umwälzung des Öls im Schmiermittelkreislauf (2),
    - einem Öltemperatursensor (23),
    - einem Öltemperatur-Steuerkreislauf (3) mit einem Flüssig/Flüssig-Tauscher (30),
    - einer Steuereinheit (4), die mit der Pumpe (21), dem Öltemperatursensor (23) und einem Fahrzeugstart-Erfassungsmodul (5) verbunden ist, dadurch gekennzeichnet, dass die Steuereinheit (4) die Pumpe (21) aktiviert, wenn die Öltemperatur unter einem ersten Wert liegt und wenn das Fahrzeugstart-Erfassungsmodul einen bevorstehenden Start des Fahrzeugs erfasst.
  8. Schmierkreislauf eines Kraftfahrzeuggetriebes nach Anspruch 8, dadurch gekennzeichnet, dass der erste Temperaturwert zwischen -10 °C und 10 °C liegt.
  9. Schmierkreislauf für ein Kraftfahrzeuggetriebe nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass der Öltemperatur-Steuerkreislauf mit einem Batterietemperatur-Steuerungsflüssigkeitskreislauf des Kraftfahrzeugs verbunden ist und dass eine Steuereinheit den Batterietemperatur-Steuerungsflüssigkeitskreislauf des Kraftfahrzeugs so steuert, dass er vor dem Starten des Fahrzeugs aktiviert wird, um die Temperatur im Wärmetauscher des Öltemperatur-Steuerkreislaufs zu erhöhen.
  10. Kraftfahrzeug, dadurch gekennzeichnet, dass es einen Kreislauf zur Schmierung eines Getriebes nach einem der Ansprüche 7 bis 9 umfasst.
  11. Steuereinheit zur Steuerung mindestens der folgenden Komponenten:
    - einer Pumpe (21) eines Schmierkreislaufs eines Fahrzeuggetriebes, und zum Empfangen von Signalen von mindestens:
    - einem Temperatursensor (23) für das Öl im Schmiersystem,
    - einem Fahrzeugstart-Erfassungsmodul (5),
    dadurch gekennzeichnet, dass die Steuereinheit so konfiguriert ist, dass sie die Schritte des Verfahrens zur Steuerung der Öltemperatur eines Kraftfahrzeuggetriebes nach einem der Ansprüche 1 bis 6 durchführt.
EP21166410.7A 2021-03-31 2021-03-31 Verfahren zur verwaltung der öltemperatur eines getriebes eines kraftfahrzeugs Active EP4067632B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP21166410.7A EP4067632B1 (de) 2021-03-31 2021-03-31 Verfahren zur verwaltung der öltemperatur eines getriebes eines kraftfahrzeugs
US17/695,522 US11892072B2 (en) 2021-03-31 2022-03-15 Method of managing the oil temperature of a transmission of a motor vehicle
CN202210281785.9A CN115143270A (zh) 2021-03-31 2022-03-22 管理机动车辆变速器的油温度的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP21166410.7A EP4067632B1 (de) 2021-03-31 2021-03-31 Verfahren zur verwaltung der öltemperatur eines getriebes eines kraftfahrzeugs

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EP4067632A1 EP4067632A1 (de) 2022-10-05
EP4067632B1 true EP4067632B1 (de) 2024-09-18

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EP (1) EP4067632B1 (de)
CN (1) CN115143270A (de)

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Publication number Priority date Publication date Assignee Title
EP4067632B1 (de) * 2021-03-31 2024-09-18 Volvo Truck Corporation Verfahren zur verwaltung der öltemperatur eines getriebes eines kraftfahrzeugs

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EP4067632A1 (de) 2022-10-05
US11892072B2 (en) 2024-02-06
CN115143270A (zh) 2022-10-04
US20220316577A1 (en) 2022-10-06

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